Abstract: Disclosed is a method for preparing a floor comprising the steps of preparing one or more floor structures comprising an upper surface arranged in parallel to a lower surface; and one or more channels disposed vertically between the upper and lower surfaces and longitudinally extending along the upper and lower surfaces, each of the one or more channels having a top and a bottom; preparing a foundation; attaching a sill plate to the foundation; placing one or more floor structures on top of the rimboard and attaching the floor structure to the sill plate and foundation.